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https://issues.apache.org/jira/browse/LOG4J2-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14053379#comment-14053379
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Ralph Goers commented on LOG4J2-702:
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First, I have to assume the problem description is incorrect and that all
references to LoggerContext should be LoggerConfig?
Second, the clearAppenders method is called by stop (and really shouldn't be
called by anything else). The stop method should only be called after
updateLoggers has been called to transfer logging to a new configuration, in
which calls all logging events would go there, not to the current configuration
or during a shutdown, at which point logging shouldn't be happening.
Do you have a stack trace that shows an actual problem or is this a
hypothetical exercise?
> LoggerContext#waitForCompletion is not thread safe
> --------------------------------------------------
>
> Key: LOG4J2-702
> URL: https://issues.apache.org/jira/browse/LOG4J2-702
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.0-rc2
> Reporter: Sean Bridges
> Assignee: Matt Sicker
> Priority: Critical
> Fix For: 2.0
>
>
> This is in trunk, svn commit 1608156
> LoggerContext#waitForCompletion uses an AtomicInteger counter to try to
> detect if there are any calls currently executing the log(Event) method, but
> it does not do so in a thread safe manner. Consider two threads A and B,
> where Thread A is calling clearAppenders(), and Thread B is calling
> log(Event),
> {code}
> Thread A loggerConfig.clearAppenders()
> Thread A loggerConfig.waitForCompletion()
> Thread A counter.get() //returns 0
> Thread A //loggerConfig.waitForCompletion() returns
> Thread B loggerConfig.log(Event)
> Thread B counter.increment()
> Thread A proceeds assuming no log calls are onging, but thread B is in the
> log method
> {code}
> I'm not sure what the requirements are, but if the requirement is to not lose
> logging events, I think you need some sort of synchronization outside of the
> LoggerContext object.
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